Flexible attapulgite membrane and preparation method thereof

A technology of attapulgite and flexibility is applied in the field of attapulgite membrane and its preparation, which can solve the problem of inflexibility of membrane materials, and achieve the effects of obvious flexibility, uniform texture and large specific surface area.

Inactive Publication Date: 2015-12-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, only one related patent report (Patent "A Method for Preparing Attapulgite Film", application number: 201310194949.5) has been found in the research of film formation using attapulgite with a one-dimensional crystal structure as the main matrix. In order to attach attapulgite to the surface of the ceramic substrate, and then sinter to obtain a membrane material with the ability to intercept inorganic ions, but the obtained membrane material is not flexible.

Method used

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  • Flexible attapulgite membrane and preparation method thereof
  • Flexible attapulgite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) At room temperature, weigh 20 g of attapulgite and disperse it in 400 mL of deionized water, add 20 mL of 1M HCl solution, stir vigorously with a mechanical stirrer for 12 hours, then filter to remove large particles and impurities, and centrifuge to obtain acidified attapulgite. Then wash the acidified attapulgite with deionized water, then disperse it in deionized water, centrifuge and wash repeatedly until the filtrate is neutral.

[0031] (2) Dry the attapulgite in step (1) in a blower dryer at 100° C., grind it into powder, and pass through a 100-mesh sieve to obtain purified attapulgite. Disperse 2 g of the purified attapulgite in 400 mL of deionized water, ultrasonically disperse it in an ultrasonic cleaner for 180 min, and separate the stable floc in the upper layer to obtain the attapulgite suspension.

[0032] (3) Concentrate the attapulgite suspension in step (2) until viscous in a blast dryer at 60°C. Measure a known volume of the suspension, dry it in ...

Embodiment 2

[0037] Steps (1), (2), (3) are the same as steps (1), (2), (3) of Example 1.

[0038] (4) Dissolve 0.56g of cornstarch in 50g of deionized water, heat and stir in a water bath at 60°C for 8 hours until completely dissolved, and take 5mL of starch solution at a speed of 0.5mL / min at the speed of a magnetic stirrer at 800r / min Add dropwise to 45mL of the attapulgite suspension in step 3 (attapulgite: corn starch mass ratio is about 100:4), after the dropwise addition, reduce the speed of the magnetic stirrer to 200r / min, and stir for 8h.

[0039] (5) Take 30 mL of the suspension obtained in step (4) and place it in a plastic petri dish with a diameter of 50 mm, and evaporate water at a constant temperature in a vacuum oven at 60° C. to obtain a flexible attapulgite film. The attapulgite membrane was subjected to a three-point bending mechanical test. The circular attapulgite membrane with a diameter of 48.5mm and a thickness of 0.6mm can withstand a load of 1.71N, with a deflect...

Embodiment 3

[0041] (1) At room temperature, weigh 25g of attapulgite and disperse it in 500mL of deionized water, and add 10mL of 0.5MH 2 SO 4 Solution, stirred vigorously with a mechanical stirrer for 12 hours, then filtered to remove large particles and impurities, centrifuged to obtain acidified attapulgite, then washed the acidified attapulgite with deionized water, then dispersed it in deionized water, centrifuged, Washing is repeated several times until the filtrate is neutral.

[0042] Steps (2), (3) and (5) are the same as steps (2), (3) and (5) of Example 1, wherein the mass concentration of the attapulgite suspension is 2.03%

[0043] (4) Dissolve 3g of polyvinyl alcohol in 97g of deionized water, heat and stir in an oil bath at 90°C for 6 hours until completely dissolved, and take 1mL of polyvinyl alcohol solution at a speed of 800r / min with a magnetic stirrer at 0.5mL / Add it dropwise to 49mL of the attapulgite suspension in step 3 (the mass ratio of attapulgite to polyvinyl a...

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Abstract

The invention relates to a flexible attapulgite membrane and a preparation method thereof. Attapulgite is the matrix of the membrane, and water soluble polymer is the additive, and the mass ratio of attapulgite to water soluble polymer is 100:1-6. The preparation method comprises the following steps: dispersing attapulgite membrane into water, adding diluted acid, stirring, filtering, washing the membrane to neutral, drying, grinding, sieving, dispersing the powder into water, subjecting the solution to an ultrasonic treatment, separating to obtain attapulgite suspension; dropwise adding a water soluble polymer solution into the attapulgite suspension under stirring, blending and stirring to obtain blended suspension; filling the blended suspension into a mould, and evaporating the suspension in the mould at a constant temperature of 40 to 70 DEG C so as to obtain the flexible attapulgite membrane. The provided preparation technology is nontoxic and harmless. The prepared flexible membrane is flexible, has high thermal stability and a good absorbing performance, and can be applied to the fields such as air purification, waste liquid filtration, and the like.

Description

technical field [0001] The invention belongs to the field of attapulgite film and its preparation, in particular to a flexible attapulgite film and a preparation method thereof. Background technique [0002] Due to the characteristics of high temperature resistance, acid and alkali resistance, rigidity and good mechanical strength, inorganic membranes can be widely used in food industry, biochemical industry, chemical industry, energy engineering, environmental engineering, electronic technology and other fields, especially in gas separation, membrane Catalysis and other fields show broad prospects for development. But at the same time, inorganic membranes also have shortcomings such as inelasticity, brittleness, and difficulty in processing and molding, which affect the current application. [0003] Clay films belong to inorganic films, and the research on clay films with clay as the main matrix is ​​rare. The clay particles with a layered crystal structure used by Bachua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00C02F1/44C02F1/28
Inventor 陈大俊朱业凯兰野
Owner DONGHUA UNIV
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